Adding: 'I've known him since I was 21 years old, you know? He produced my first single. So he's been really good to me.'

Katharine noted that 'People can say whatever they want.' She called herself 'pretty single.'

The TV star was snapped on a dinner date with David last month; she put her hand on his backside as well as planted a kiss on his cheek during their outing together.

Katherine also spoke about her ex - actor Elyes Gabel - who she dated until 2016; they still work together on the show Scorpion.

Risque: the 33-year-old addressed rumors that she is dating music producer David Foster in the December issue of Health magazine

Revealing look: The singer showed off her incredible figure in the revealing shoot, posing in underwear - even going topless for one snap

Happy days: Katharine was spotted looking stunning as she stepped out for dinner with a pal at Madeo restaurant

The former American Idol contestant said 'I had a relationship with my lead actor on my show that was almost two years,' adding that 'I still am crazy about him, and we have a great working relationship.'

While she said 'its definitely not the easiest thing to get over someone' when you see them everyday, it's an 'adjustment.'

She said since their relationship, she hasn't 'had anything super serious since.'

Just friends? the couple were spotted together in September at the Grammy Museum gala

Good terms: Katharine and ex Elyes Gabel still work together on the show Scorpion; pictured with their stunt doubles